MONTONE.42 is a MADI (AES10) to Audio-over-IP bridge based on RAVENNA audio networking technology and supporting AES67 and SMPTE ST 2110-30 / -31. As the demand for Ethernet-based transmissions in professional audio environments increases, MONTONE.42 provides seamless integration of network audio with existing infrastructures.
Equipped with four MADI and two gigabit network ports, it serves as a versatile link for broadcast, live-sound and studio applications. The network ports support redundant audio streaming as per ST 2022-7.

As a successful participant of the JT-NM Tested program MONTONE.42 is listed in the JT-NM Tested Catalog as a device aligning with the SMPTE 2110 standards.

Powerful networking, seamless interoperability

MONTONE.42 integrates RAVENNA networking technology. RAVENNA is a solution for real-time distribution of audio and other media content in IP-based network environments that offers outstanding features in terms of timing accuracy and scalability.
It is also fully AES67-compliant (the interoperability standard from AES) for seamless compatibility with other AoIP devices. MONTONE.42 offers both an AES67 profile for straightforward network integration and RAVENNA profiles for more demanding applications requiring high performance transmission at minimum latency.


MONTONE.42 can be synchronized to MADI input, word clock, video reference, network (PTP) or internal clock. The device may also serve as a network grandmaster. The achieved clock accuracy complies with AES11 throughout the whole network.

All-Round Functionality

MONTONE.42 offers highest flexibility as it provides three interface standards for MADI:

  • optical SC (single-mode or multi-mode)
  • coaxial (BNC)
  • SFP

The Small Form Factor Pluggable cage can be fitted with any SFP module suitable for the customer’s application. The configuration of MADI I/Os can be defined individually at order.


Assemble up to 32 streams with an individual number of audio channels from the MADI inputs via the integrated routing matrix. Subscribe to another 32 streams and convert the incoming audio channels to MADI.
256 channels are supported even at higher sample rates (96 kHz).

Remote control

An integrated webserver provides access via web browser through the network interface to configure network streams, audio routing and all device settings.
Basic settings are also adjustable via a local interface on the front panel.


The MADI inputs can be configured as redundant inputs with automatic fail-over switching.

Safe operation

Thanks to two phase-redundant power supplies with separate IEC inlets and AC power switches on the rear panel the device offers the highest reliability.

MADI ports (I/O): 4 x I/O ports - individually configurable
Network: 2 x RJ45 Socket (1 Gbit/s)
Headphone Out: 1 x 6.3 mm TRS jack, stereo
Modules: SC-Socket single/multi-mode
coaxial BNC, 75 Ω
SFP cage


Sample rates: 44.1, 48, 88.2, 96, 176.4, 192 kHz (+/- 12,5%)
MADI formats: 48k / 96k Frame, 56 / 64 channel, S/MUX


Network Audio
Network-Layer: 3
Number of streams: 32
Number of channels (I/O): 256
Standards: RAVENNA, AES67, SMPTE / ST 2110-30, ST 2110-31, ST 2022-7


Headphone Out
Output level: +11 dBu
SNR: -113 dB / -117 dBA
THD @ 0 dBFS: -101 dB


Word clock (I): 1 x coaxial BNC (75 Ω termination switchable),
AES11 (DARS also supported)
Word clock (O): 1 x coaxial BNC
Video Reference (I): 1 x coaxial BNC (75 Ω termination switchable),
black burst (PAL / NTSC)
Network: IEEE 1588 v2


Remote Software: integrated web server
Remote Methods: Network


Service: USB 2.0 for firmware updates (Windows®)
Display: 3 x 16 characters LC display
Power Consumption: 15 W
Dimensions: Width 19'' (483 mm)
Height 1 RU (44.5 mm)
Depth 10'' (254 mm)
Weight: about 4 kg
USB Serial driver: Windows®


SFP modules (LC single-mode or multi-mode)


Device variants
Single-mode: MADI port: SC-Socket single-mode